I wish users would stop giving up the privacy of their users to Google for a little bit of CDN speed. Put your damn library on your own server! It's not likely that you have enough traffic to be really need it to be hosted on a CDN anyway!

To get the latest version automatically (even after the updates), just keep the base version number in the url. For example in the first url replace 1.4.3 with 1 and it'll load 1.4.4(latest version) automatically.Example: http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js